As many of you know, I've been very enthusiastic about the Nikon D7000 specs, particularly its dynamic range.
However, having recently returned from some trekking in cold regions in Nepal, in April, at 4,000 meters altitude where it gets very cold during the night, I can report that my copy of the D7000 body ceases to autofocus when it's cold.
Frequently in the mornings when it was cold but not subzero, that is, not so cold that one needed to wear gloves, the D7000 would refuse to autofocus.
After the camera had been exposed to the sun for some time, whilst dangling around my neck, it would gradually resume its autofocus capability. Not suddenly, but intermittently. After it was fully warmed, there would be no problem.
There was no doubt that the cold weather was the cause. However, there may be a doubt as to whether or not this problem is confined to my copy of this camera.
An enquiry on Google does not seem to turn up any clear problem in this area, regarding D7000 autofocussing in cold weather, so I wonder if any readers of this forum can confirm that they also have experienced such a problem.